Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13a77227754a269…

MALICIOUS

PDF

78.8 KB Created: 2021-03-19 07:45:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 4501a8fc7e0cad983776bcc34aa0e492 SHA-1: cf96fb65b923f543167a8902a1f96b5baf4e31ee SHA-256: b13a77227754a26957d2af9c7777acb9db0eacb29ff4af2ff94f0e0a2b04785c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with at least one identified as a malicious redirector (https://dafemum.ru/award?keyword=list+of+periodic+table+elements+pdf). The document's content, though heavily obfuscated, appears to be a lure related to 'periodic table elements pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/award?keyword=list+of+periodic+table+elements+pdf In PDF document text
    • https://botoriki.weebly.com/uploads/1/3/2/6/132682976/b14681d74.pdfIn PDF document text
    • https://vopifubuk.weebly.com/uploads/1/3/1/6/131636719/fesadofuwunumuf-kutut-zigijemonefus-xibodoxur.pdfIn PDF document text
    • http://dfds.in/typewriter_repair_chicago_ilybnwh.pdfIn PDF document text
    • http://sutivetowit.mypressonline.com/84328604749.pdfIn PDF document text
    • https://kitogabizog.weebly.com/uploads/1/3/6/0/136053612/da4415fe08.pdfIn PDF document text
    • http://zijafanovidiz.sportsontheweb.net/xiratobamexisujoxeviz.pdfIn PDF document text
    • http://car-test.pro/881103286323z556.pdfIn PDF document text
    • http://matteset-spon.space/9504536638627vl2.pdfIn PDF document text
    • http://helpverifedbadges.com/kitchenaid_superba_stove_top_replacementcv9t9.pdfIn PDF document text
    • http://nujilotadotila.iblogger.org/pest_risk_analysis.pdfIn PDF document text
    • http://xiravudes.22web.org/nitatejuketuv.pdfIn PDF document text
    • http://rivilidopu.medianewsonline.com/dexawigewiro.pdfIn PDF document text
    • http://falanog.iblogger.org/jaxijozudetuni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duguteterexu.epizy.com/62670641160.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/25238128046.pdfIn PDF document text
    • http://lexanowojuraja.epizy.com/direct_indirect_exercises_with_answers.pdfIn PDF document text
    • http://gamutikaguz.rf.gd/pifukuxuxopepitoduja.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/whatsapp_plus_apk_latest_version_apkpure.pdfIn PDF document text
    • http://fuvuxejuv.myartsonline.com/forensic_accounting_for_dummies_free_download.pdfIn PDF document text
    • http://datidalumoz.rf.gd/what_medical_specialty_has_the_highest_salary.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/70967704933.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 5384 bytes
SHA-256: 7b968c9cab3b3594879608bf497a045108f8e9e0617a80bd4952eb85c265bc6a
font_01_sfnt_off000106f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F3 10924 bytes
SHA-256: a28279d53c88110a529e21244b28a0672a9e5b8100b1bec3aa1cad36120659e3

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